| Business | Phone |
| Specialized Billing Svc 1200 John Q Hammons Dr, Madison 53717 | (608) 829-4480 |
| Payment Service Network Inc 2901 International Ln 200, Madison 53704 | (608) 833-7018 |
| Luke Medical Billing Solutions 802 W Broadway, Madison 53713 | (608) 224-2184 |